error: inflate: data stream error (invalid code lengths set)

[Galli]

Try to make an update to my MM with “git pull && npm install” in the MagicMirror Directory and get these Error:

error: inflate: data stream error (invalid code lengths set)
fatal: loose object d0ecde3277023772ee3a1864f9a113a1c215cc8a (stored in .git/objects/d0/ecde3277023772ee3a1864f9a113a1c215cc8a) is corrupt
fatal: The remote end hung up unexpectedly

How can i resolve this?
I´m not so firm with the command line so i dont know what tod do!
Thanks for your Help